package com.nulldev.util.internal.backport.httpclient_rw;

import java.io.IOException;
import java.net.CookieHandler;
import java.util.List;
import java.util.Map;

import com.nulldev.util.internal.backport.httpclient_rw.impl.common.HttpHeadersBuilder;
import com.nulldev.util.internal.backport.httpclient_rw.impl.common.Log;
import com.nulldev.util.internal.backport.httpclient_rw.impl.common.Utils;
import com.nulldev.util.internal.backport.optionals.Optional;

class CookieFilter implements HeaderFilter {

	public CookieFilter() {
	}

	@Override
	public void request(HttpRequestImpl r, MultiExchange<?> e) throws IOException {
		HttpClientImpl client = e.client();
		Optional<CookieHandler> cookieHandlerOpt = client.cookieHandler();
		if (cookieHandlerOpt.isPresent()) {
			CookieHandler cookieHandler = cookieHandlerOpt.get();
			Map<String, List<String>> userheaders = r.getUserHeaders().map();
			Map<String, List<String>> cookies = cookieHandler.get(r.uri(), userheaders);

			// add the returned cookies
			HttpHeadersBuilder systemHeadersBuilder = r.getSystemHeadersBuilder();
			if (cookies.isEmpty()) {
				Log.logTrace("Request: no cookie to add for {0}", r.uri());
			} else {
				Log.logTrace("Request: adding cookies for {0}", r.uri());
			}
			for (Map.Entry<String, List<String>> entry : cookies.entrySet()) {
				final String hdrname = entry.getKey();
				if (!hdrname.equalsIgnoreCase("Cookie") && !hdrname.equalsIgnoreCase("Cookie2"))
					continue;
				List<String> values = entry.getValue();
				if (values == null || values.isEmpty())
					continue;
				for (String val : values) {
					if (Utils.isValidValue(val)) {
						systemHeadersBuilder.addHeader(hdrname, val);
					}
				}
			}
		} else {
			Log.logTrace("Request: No cookie manager found for {0}", r.uri());
		}
	}

	@Override
	public HttpRequestImpl response(Response r) throws IOException {
		HttpHeaders hdrs = r.headers();
		HttpRequestImpl request = r.request();
		Exchange<?> e = r.exchange;
		Log.logTrace("Response: processing cookies for {0}", request.uri());
		Optional<CookieHandler> cookieHandlerOpt = e.client().cookieHandler();
		if (cookieHandlerOpt.isPresent()) {
			CookieHandler cookieHandler = cookieHandlerOpt.get();
			Log.logTrace("Response: parsing cookies from {0}", hdrs.map());
			cookieHandler.put(request.uri(), hdrs.map());
		} else {
			Log.logTrace("Response: No cookie manager found for {0}", request.uri());
		}
		return null;
	}
}
